Ruhan is the Knight of 4 in the special group The Knights of Round in the OoMN. Ruhan has the power over fire and his mask power lets him disrupt mask and elemental powers for 30-60 seconds. He can hold it out longer but this causes his energy to drain rapidly. Ruhan comes from the island of Feran Nui, the same island that Calder comes from aswell. Feran left Feran Nui after his home was raded by a band of crazed Makuta. He left and joined the OoMN. After years of training he became the Knight of 4 in the Knights of Round. He was surprised to find that his old childhood friend Calder was the Knight of 1.